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Firefox sync isn't installing fully

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I have a PC and notebook, both running Windows 7 Pro 64 bit. I have Nightly (beta) on the PC, Firefox (new installation) on the notebook. I want to sync. The PC goes through part of the process, the menu at top right shows my e-mail address. Options "sync" shows a bunch of checked boxes (for passwords etc). Clicking on "Manage" brings up a screen with "sign out" and "change password" - no recovery key, so I can't work back from the notebook as the second device. What do I do?

I have a PC and notebook, both running Windows 7 Pro 64 bit. I have Nightly (beta) on the PC, Firefox (new installation) on the notebook. I want to sync. The PC goes through part of the process, the menu at top right shows my e-mail address. Options "sync" shows a bunch of checked boxes (for passwords etc). Clicking on "Manage" brings up a screen with "sign out" and "change password" - no recovery key, so I can't work back from the notebook as the second device. What do I do?

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The current Nightly uses a new version of Sync that works differently and no longer uses a Sync key that is kept on the computer, but instead automatically generates the Sync key from the password.
You can no longer Sync to devices that use the previous version of Sync.